Here is PollTrack's 19 January 2016 ranking of announced and presumptive GOP candidates, from most to least likely to prevail. Starting with the 1 January Ranking: PollTrack has narrowed the field to the most viable candidates:

Here is PollTrack's 12 January 2016 ranking of announced and presumptive GOP candidates, from most to least likely to prevail. Starting with the 1 January Ranking: PollTrack has narrowed the field to the most viable candidates:

Here is PollTrack's 6 January 2016 ranking of announced and presumptive GOP candidates, from most to least likely to prevail. Starting with the 1 January Ranking: PollTrack has narrowed the field to the most viable candidates: